Less is more: an open-framework zirconium phosphate with unusual 7-ring channels was synthesized ionothermally from a deep-eutectic solvent. This small-pore material displays a CO(2)/CH(4) adsorption ratio (17.3 at 1 bar) that is significantly higher than that of typical 8-ring materials, making it highly attractive for CO(2)/CH(4) separations. 相似文献
Cross sections of the 58,60,61Ni(n, α)55,57,58Fe reactions were measured at 8.50, 9.50 and 10.50 MeV neutron energies based on the HI-13 tandem accelerator of China Institute of Atomic Energy (CIAE) with enriched 58Ni, 60Ni, and 61Ni foil samples with backings. A twin gridded ionization chamber (GIC) was used as the charged particle detector, and an EJ-309 liquid scintillator was used to obtain the neutron energy spectra. The relative and absolute neutron fluxes were determined via three highly enriched 238U3O8 samples inside the GIC. The uncertainty of the present data of the 58Ni(n, α)55Fe reaction is smaller than most existing measurements. The present data of 60Ni(n, α)57Fe and 61Ni(n, α)58Fe reactions are the first measurement results above 8 MeV. The present experimental data could be reasonably reproduced by calculations with TALYS-1.9 by adjusting several default values of theoretical model parameters. 相似文献
A new medium, used to generate lead hydride, was optimized as 0.3% (w/v) oxalic acid-2% (w/v) ammonium cerium (III) nitrate-8% (w/v) potassium tetrahydroborate-1% (w/v) sodium hydroxide solution; 950°C is used for atomization. The characteristic concentration (0.0044 absorbance) obtained under these conditions was 0.04 ng ml?1. The application of this medium to soil and ferromagano-brass samples is illustrated. 相似文献
Reactions of the hydrido‐butenylcarbyne complex [OsHCl2(≡CC(PPh3)=CHEt)(PPh3)2]BF4 ( 1 ) with nitriles RC≡N (R=2‐cyclopropyl‐2‐oxopropyl, 3‐amino‐2‐oxobutyl) lead to six‐membered cyclic vinylidene complexes 3 and azavinylidene complexes 4 , that is, iso‐osmapyridiniums. Treatment of 1 with excess 2‐formylbenzonitrile at reflux temperature in CHCl3 in the presence of air produces a fused osmapyridinium 8 , which is first oxidized to the tricyclic iso‐osmapyridinium derivative 7 , then to iso‐osmapyridinium 9 , which contains a fused naphthalenone fragment. The conversion of iso‐osmapyridinium 9 (with a vinylidene segment) to the iso‐osmapyridinium compounds 10 and 11 (with azavinylidene segments) was achieved in the presence of a hydrogen halide, such as HCl or HI. The molecular structures of the complexes synthesized were confirmed by X‐ray studies. Moreover, the aromatic stabilization energy and nucleus‐independent chemical‐shift values of the osmapyridiniums and the strain in the iso‐osmapyridinium rings were investigated by DFT calculations. 相似文献
This paper presents a detailed survey of the research on warehouse design, performance evaluation, practical case studies, and computational support tools. This and an earlier survey on warehouse operation provide a comprehensive review of existing academic research results in the framework of a systematic classification. Each research area within this framework is discussed, including the identification of the limits of previous research and of potential future research directions. 相似文献
On their best behavior : Three zirconium compounds with one‐, two‐, and three‐dimensional structures have been successfully synthesized by the ionothermal approach. The 3D zirconium phosphate (see picture; F green, H white, O red, P pink, Zr yellow) exhibits high catalytic performance, with a cyclohexane conversion ratio of 32 % and cyclohexanone selectivity of up to 83 %.